Hawker 800 XP, Pilot Training Manual

Page: 205 / 504

CONTROL AND INDICATIONS
Normal Procedures
The APU provides a source of air for air con-
ditioning and 28.0 volt DC power for ener-
gizing the airplane’s DC electrical system. A
description of the electrical system follows.
The APU utilizes fuel from the LH. fuel tanks.
The LH aircraft fuel boost pump must be turned
ON prior to the APU starting cycle.
The APU controls and annunciator lights are
located an a single panel mounted behind the
pilot seat.
APU generator is on line whenever APU is run-
ning (see Figure 6-1 or 6-2).
APU Indications
The APU control panel (Figure 6-2) is located on
the flight compartment overhead panel and con-
tains essential operator switches and indicators.
Panel switches and indicators are as follows:
• DC LOAD Indicator —Indicates current
being generated by the APU.
• R P M I n d i c a t o r — A P U r evo l u t i o n s
per minute.
• EGT Indicator —APU exhaust gas tem-
perature (EGT °F).
• MAIN TEST OVV Switch —Tests gen-
erator control units ability to trip APU
generator off-line.
• LAMP TEST Switch —Insures all panel
warning lamps are operable.
• GEN Switch —Manually controls gen-
erator function.
• BLEED AIR Switch —Opens and closes
load control switch.
• MASTER Switch —Provides power to
APU system and initiates start sequence.
Revision 1 6-3
FOR TRAINING PURPOSES ONLY
HAWKER 800 XP PILOT TRAINING MANUAL
FlightSafety
international
OFF
AMPERES
DC
APU
1
0
2
3
4
5
10
60
100
0
x 1000
•C
APU CONTROL
LOW OIL
PRESS
HIGH OIL
TEMP
BLEED AIR
VALVE FAIL
APU
GEN
BLEED
AIR ON
READY TO
LOAD
MAIN TEST
OVV
NORM
GEN
CLOSE
NORM
MASTER
START
LAMP TEST
TEST
NORM
BLEED AIR
ON
OFF
STOP
APU
FIRE
ON
FIRE
FIRE
E
X
T
PUSH TO TEST
40
%
Figure 6-1. Garrett APU